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My girlfriend has a 1987 iroc 350 multiport injection. It was very neglected. I have been trying to figure out some engine problems it has been having. It was difficult to get started, and when it did run it smelled rich and was lacking in power. I changed the starter, thermostat, air filters, fuel filter, fuel pressure regulator (while I had the air plenum apart I changed all the gaskets and manifold air heat sensor), mass air flow sensor, spark plugs and wires, checked fuel pressure (it’s good), there are no vacuum leaks. It now starts fine, has plenty of power, but idles very rough (at times idle speed will drop until it stalls), it runs perfect when driving. So I’m about to change air idle regulator, o2 sensor, and check (and adjust) throttle position sensor. Any advice anyone has would be appreciated.
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It sounds like you are on the right track. Making sure the Idle Air Control Valve is clean and working would be my first step as well. Also it may be a good idea to give the engine a tune up if it has been a while. Good plugs, cap, rotor and wires can make a huge difference in how the motor runs. Hope this helps.
Yeah, the first thing I did was change the oil and filter,air filters, plugs, wires, distributor, rotor, I also changed the ignition solenoid. Thanks though, I’ll post my results after changing the air idle control and checking throttle position sensor.
I agree you may be onto something with the idle control valve but you might want to check for vacuum leaks just in case.
TPI was good. I changed the o2 sensor and air idle control and it is running like a champ now. Thanks for the tips guys
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